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What is the difference between startup Nomount and startup Mount in Oracle startup?

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What is the difference between startup Nomount and startup Mount in Oracle startup?

Answer: Startup Nomount: Launch instance, read parameter file, allocate memory space, start background process, open trace file and alarm file. Startup mount: Mount the database and open the control file. The Nomount mode has not yet read the control file, which is used when the database control files are all corrupted and need to recreate the database control files or create a new database. The Mount option does not open a data file that can be used to modify the operating mode of the database or to perform database recovery.

What is the difference between startup Nomount and startup Mount in Oracle startup?

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